import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 666
 * Date: 2023-04-05
 * Time: 9:31
 */
public class UdpEchoServer {
    DatagramSocket socket = null;

    public UdpEchoServer(int port) throws SocketException {
        socket =  new DatagramSocket(port);
    }
    public void start() throws IOException {
        while (true){
            DatagramPacket requestPacket = new DatagramPacket(new byte[5000], 5000);
            socket.receive(requestPacket);
            String request = new String(requestPacket.getData(),0, requestPacket.getLength());
             String response=process(request);
            DatagramPacket responsePacket = new DatagramPacket(response.getBytes(),response.getBytes().length,requestPacket.getSocketAddress());
            socket.send(responsePacket);
            System.out.println("返回响应为"+response);
        }
    }

    public String process(String request) {
      return   request;
    }

    public static void main(String[] args) throws IOException {
        UdpEchoServer udpEchoServer = new UdpEchoServer(6666);
        udpEchoServer.start();
    }
}
